Carry foil mechanism



J. A. v. TURCK CARR-Y FOIL MECHANISM Filed Sept. 21, 1940 3 Sheets-Sheet l Aug. 7, 1945. J. A. y. TURCK 2,381,788

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CABRY FOIL MECHANI SM ,1.- A.vv. TURCK 2,381,788 a Filed Sept. 21,1940 3 Sheets-Sheet 3 l my a Patented Aug. 7, 1945 CARRY FOIL MECHANISM Joseph A. V. Turck,'wilmette, Ill., assignor to Felt and Tarrant Manufacturing Company, Chicago, 11]., a corporation of Illinois Application September 21, 1940, Serial No. 357,677

19 Claims.

This invention relates in general to calculating machines and, while it is illustrated herein as being incorporated in a machine similar to that disclosed in my prior United States Letters Patent No, 2,063,962, issued December 15, 1936, it will be readily appreciated that the invention has-other and more general valuable applications.

In calculating machines of the type shown in said patent, and generally in substantially all machines having actuating mechanism adapted to drive the registering or accumulating mechanism in only one direction, subtraction is performed by a process of complemental addition. For example, if it is desired to subtract 127 from the number 824, the latter is registered in the numeral wheels of the accumulator, and the nines complement of the subtrahend less one, or the tens' complement of the units order and the nines complement of all other orders of the subtrahend, namely, 873, is added to the minuend. This would normally leave a result of 1697 in the accumulator. In certain of the prior art machines, such as those disclosed in the patents to D. E. Felt, No. 767,107 and No. 960,528, issued on August 9, 1904, and June 7, 1910, respectively, a subtraction or carry cut-out lever is provided in association with each denominational order of accumulator mechanism, except the units order, which is selectively operable to prevent a transfer or a carry of the tens thereto. These subtraction levers are manually operable, and must be held in operative position in orderto prevent a transfer to the associated order of accumulator mechanism. In performing the above problem on such a machine, by actuating the-subtraction lever in that order to the left of the first figure of the subtrahend and manually retaining the same in operative position, the carrying of the tens to such order of the accumulator is prevented, and the correct result, 697, will appear on the numeral wheels of the accumulator. Means are provided in the patent to C. Wittenmyer, No. 1,840,378, issued on January 12, 1932, for locking such subtraction levers in operative or carry foiling position, and for automatically unlocking the same to permit the return thereof to inoperative position only after a carry has been attempted and foiled thereby. However, it is still incumbent upon the operator to select the proper subtraction lever to be operated in any given instance, and to move only that particular lever to operative position.

A principal object of this invention, therefore, is the provision in such a calculating machine of means for relieving the operator of the responsibillty and effort of selecting .one of a plurality of subtraction levers in order to foil undesired carrying of tens.

Another important object of the invention is the provision of means in a calulating machine for automatically foiling the undesired carry of the tens to that order of the accumulator mechanism next higher than the highest order of the minuend, in a subtractive operation, by depression of a single key, as well as the elimination of the manipulativemeans heretofore necessary to accomplish the desired result.

A further important object of the invention is the provision of a subtraction control key which, when depressed, causes the carry of the tens to the nexthigher order of the accumulator to be automatically and positively prevented upon subsequent depression of any digital key representing the first or left hand figure of the subtrahend.

Another important object of the invention is the provision of means for automatically latching v the carry transfer means in the proper denominational order, and for automatically releasing the same after a carry has been attempted and foiled.

A further important object of the invention is the provision of means for automatically releasing such carry transfer foiling means' whenever the accumulator is zeroized.

Another important object of the invention is the provision of means for automatically re-conditioning the machine for additive actuation after a subtractive operation has taken place.

A further object of the invention is the provision of means for preventing the setting of the carry transfer foiling means during operation of the additive actuating mechanism of the machine.

Another object of the invention is the provision of means for preventing the operation of the carry transfer foiling means during zeroizing of the accumulator.

Numerous other objects and advantages of the invention will be apparent as it is better understood from the following description, which, when taken in connection with the accompanying drawings, discloses a preferred embodiment thereof.

In the drawings,

Figure 1 is a top plan view, broken away centrally from front to back, of :2 calculating machine embodying the features of my invention, and showing the add and subtract keys located to the left of the ordinal series of digital keys;

Figure 2 is a front to back vertical section taken through the calculating machine shown in Fig. l on a plane arranged alongside a column or order of digital keys, with parts broken away;

Figure 3 is a fragmentary elevational view of the mechanism for controlling the operation of the carry cut-out levers;

Figure 4 is a perspective view of a carry cut-out or subtraction lever and associatedparts;

Figure 5 is a fragmentary elevational view of the accumulator zeroizing means and the carry transfer lock releasing means; and

Figure 6 is a fragmentary elevational view of the carrying pawl latch releasing means.

For the purpose of illustrating my invention, I have shown in the drawings a key-responsive, power operated calculating machine similar to that shown and described in Patent No. 2,063,962, hereinbefore referred to. Referring more particularly to the drawings, the calculating machine is shown as having an outer casing 2| within which the various instrumentalities of the machine .are mounted on skeleton frame members or partition plates 22 (Fig. 2) disposed between the actuating mechanisms of the several'denominational orders and secured together in spaced relationship at suitable points by tie-rods 23. A plurality of columns of digital keys 24 are arranged to extend through a keyboard 25, positioned as part of the upper wall of the casing 2|, which keys are adapted for manipulation to determine the digital degree of actuation to be imparted to the different denominational orders of a multiple order accumulator mechanism. Each column of keys controls the rotation of an accumulator actuating pinion 26 (shown in brokenlines in Fig. 2) journaled upon a transverse shaft 21 that extends across the machine and is sup-- ported by the frame members 22. Rotation of each of the actuating pinions 26 is transmitted through an internal ratchet mechanism to a com 'bined lantern wheel and accumulator gear 28 whichis also iournaled on the shaft 21. The gear of the lantern wheel 28 meshes with a carrying gear, sometimes called the carrying spring winding gear (not shown), Journaled on a shaft 29, which is disposed in parallel relationship to the shaft 21. The carrying gear also meshes with an intermediate gear 3| journaled on a transverse shaft 32, which in turn meshes with a numeral wheel pinion 33 journaled on a transverse shaft 34 and fixed to a numeral wheel 35.

Carrying mechanism is provided in each de- November 2, 1920, and includes a carrying-cam I member 38, which is given a 180 rotation by a suitable carrying motor spring 31 associated with the carrying gear of the next lower denominational order for each tens transfer that is to be effected. The carrying-cam member It acts upon a dolly roll 8| secured to a bell crank carrying-lever i! to swing the latter in a clockwise direction, viewing Fig. 2. Such swinging of the carrying-lever I! causes a carrying pawl 4| pivotally mounted on said lever to throw the lantern wheel and accumulator gear 2| a sumcientdistancetoimpcrathroughthetrainof medigitalunitoiactuationtothenumeral The adding is accomplished upon depression of the keys 24 and corresponding actuation of rack sectors 42 which are in mesh with the pinions 26, a said sector being associated with each denominational section of the accumulator unit in association with its controlling column of keys. The rack sectors and the control and actuating mechanisms for them are duplicated for each denominational order of the calculating machine, and a general description of a single set of such mechanism will be suflicient for an understanding of them all, except that they have to be arranged .and adapted to cooperate selectively and collectively with the power members.

The rack sectors 42 are mounted upon a shaft 43 which extends through the partition plates 22 of the machine, and are adapted to be moved downwardly (viewing Fig. 2) on an idle or set:- ting stroke in amount determined by the value of the particular digital key 24 of the associated column depressed, this amount increasing in graduating steps from one to nine. Upon depression of any key 24, power is supplied by an electric motor, indicated generally at 44 (Fig. 2), through a power shaft 45, which is connected to the motor in any suitable manner, to extend a spring 46 associated with the particular order of mechanism with which the key depressed is identified, release of this spring thereafter accomplishing adding movement in amount determined by the particular key of the order depressed. Upon depression of said key, the rack segment 42 is moved through its idle or downward stroke by the power shaft 45 into position to impart proper and accurate, digital accumulation to the adding mechanism upon its return movement, which is accomplished by the associated spring 46.

In the calculating machine shown in the drawings, depression of a key 24 causes its stem 41 to engage a parallel motion bar 48 which is pivoted at the front at 49 and at the rear at 5| to levers 52 and 53, which levers are pivoted in turn upon cross shafts or rods 54 extending through the partition plates 22. A link 55 is pivotally connected at 56 to the lever 52 and at 51 to the lever 53. The bar 48, levers 52 and 53 and the link 55 form part of a parallel motion device and are constructed and mounted as shown and described in United States Letters Patent No. 2,063,962, earlier mentioned. Further and more particular description of these parts is therefore thought to be unnecessary. Each of the rack sectors 42, as stated above, is pivoted upon the cross shaft 43, and is respectively connected to a hook 58 by a link-59, and to a movement controlling bar 6| by a link 62 (Fig. 2), the former said connection being through a compensating device 63. The operation 01 the parts is such that upon depression of a key 24, the stem 41 engages and depresses the bar 48. imparting motion to the parallel motion device, and through suitable control mechanism which it is thought need not be described herein in detail, but includes a dog '4 pivoted on the bar 48, moving the hook 58 down into engagement with a toothed wheel 66 which is fastened to the power shaft 45. The engagement of the hook II with the wheel pulls the link I! toward the lelt, viewing Fig. 2, which imparts downward motion to rack sector 42 and link I! through the compensating device 63. Forward motion is thus imparted to the digital control bar ll, until me of several lugs projecting laterally therefrom a s oppodby thestemflotthekeyudem The link 59 extends the spring 45, and moves the rack sector 42 downwardly on an idle stroke and into position to impart an adding movement upon release of the hook 58 and contraction of the spring. The downward movement of the rack sector 42 is under the control of the digital control bar 6i, and the rack sector is halted when it has been moved downwardly the proper distance, enabling it upon return to impart the degree of digital advancement to the adding mechanism which corresponds to the particular key depressed. The compensating device 53 permits the continuation of the rearward movement of the link 59 after downward movement of the rack sector 42 has been stopped, and until the end of the power stroke and the automatic release of the hook 58. The release of the hook 58 is accomplished automatically in each instance, after a set increment of action has been imparted to the link 59, by the teeth of the wheel 65. Upon the return stroke (the operative stroke of the rack sector), the compensating device 63 permits movement of the parts in reverse direction to thebeginning of the adding movement and thereafter the adding actuation is accomplished.

It is apparent, therefore, that upon depression of a key 24, the digital control bar 8i determ nes the degree and extent of the downward movement of the rack sector 42, and the bar 48 initiates the connection of the rack sector to the power mechanism. In this operation, the key 24 which has been operated is held depressed until release of the hook 58 from the wheel 55, when the key will be released and returned to normal raised position. It will be understood that, while no two keys 24 of the same column or denominational order may be operated simultaneously, any key of one order may be operated at the same time as any desired key of any other denominational order or orders.

The accumulator is adapted to be cleared or zeroized by interrupting the connections between the numeral wheels and the actuating mechanism therefor. More particularly, zeroizing is effected by detraining or disengaging the carrying spring winding gears from the accumulator actuatin pinions 2-5. To this end, the shafts 21, 32 and 34 are mounted in and supported by the skeleton frame members 22. The shaft 29 of the carrying spring winding gears, however, is mounted in a swinging frame that is adapted to have a slight outward or forward pivotal movement (to the right in Fig. 2) on an axis coincident with the shaft 32. This swinging frame is made up of a plurality of partition plates 66 connected together at suitable points'by transverse tie-rods 61.

As the swinging frame carries the shaft 25 of the carrying spring winding gears, the latter'are disengaged from the pinions 26 whenever. the frame is swung to the right of its normal position of Fig. 2. Such swinging of said frame is accomplished by a short clockwise rocking movement (viewing Fig. 2) of a transverse shaft 58 that is journaled in th fixed skeleton frame members 22. Rocker arms 69 (only one of which is shown in Fig. 2) are fixed at one end on the shaft 68. and are pivotally connected at their other ends to curved links H having slotted shifting pivots upon a fixed transverse shaft 12. The forward end of each link II is provided with a pin I3 positioned within the spaced jaws of abifurcated member 14. The member 14 ,is pivoted intermediate its ends on a shaft I5 carried by the swinging frame hereinbefore described, and comprises the inner memill bar of a toggle. The outer member of the toggle comprises a bell crank 15 pivotally connected at its inner end to the member I4 and pivoted intermediate its ends on a stud 'I'I mounted on the associated fixed frame member 22. Consequently, rocking of the shaft 68 in a clockwise direction from its normal position of Fig. 2 shifts the curved links H toward the front of the machine by means of the arms 69. This causes the pins I3 to push down on the lower jaws of the inner ends of the toggle members 14, thereby throwing the toggles past their dead centers. Since th toggle members 14 are pivoted at 15 to the aforesaid swinging frame, such movement of the toggles is accompanied by an outward swinging of the swinging frame to detrain the carrying spring winding gears from the actuating pinions 26.

To impart such rocking movement to the shaft 68, there is provided a short transverse shaft 14 (Fig. 5) that extends through the outer casing of the machine and has an operating handle or zeroizing lever 19 secured thereto. A segment 51 is fixed upon the inner end of shaft ll, and pivoted to the segment is a link 82, which is in turn pivoted to a depending lever 83 that is pivoted at 84 on the fixed frame of the machine. The lower end of lever arm 83 is pivotally connected by a short link 85 with an arm 85 mounted on the shaft 68. A short swinging movement of crank 19 to the right, viewing Fig. 5, will, through segment Ii, link 82, lever arm 83, short link 85, and arm I. impart such movement to the shaft 68 as isnecessary to detrain or disengage the aforesaid to effect zeroizing of the accumulator. A more detailed description of the zeroizing mechanism is not thought to be necessary to a clear understandin of the instant invention, reference being hereby made to Patent No. 1,357,748, hereinbefore cited, and Patent No. 1,902,597, issued on March 21, 1933, for such a description.

The present invention provides for calculating machines of the type above described, a novel subtracting mechanism which relieves the operator of certain responsibilities and work heretofore required in the performance of a subtractive operation. For accomplishing this work, the subtracting mechanism has a plurality of carry cut-out or disabling devices, one individual to each denominational order of the accumulator and adapted when operated to disable the tens carrying mechanism of the order. The devices are normally disposed in an inactive position but are arranged to beshifted conjointly and simultaneously 'to an active position by operation of common manipulative means such as a key to condition the devices for individual operation by the actuation of any selected digital key in the same order. Thus by simply setting the manipulative means before actuating the digital key to register the first or left hand figure of the subtrahend, the carrying of tens to the next higher denominational order of the accumulator is effectually prevented.

In the particular embodiment illustrated, the disabling devices operate to prevent the undesired carrying of tens by moving the appropriate carrying pawl 4| out of its normal position into an inactive position and latching it there throughout the ensuing adding cycle of the machine.

The latched pawl is automatically released after a carry has been attempted and foiled and as an incident to such attempt thereby conditioning the machine for an additive operation. When no any is attempted, the clearing or zeroizing of the machine releases the latched carrying pawl.

As herein'shown (Figs. 1 and 3), the common 'causerockingofthe manipulative means for conditioning the disabling devices comprises a set of keys including "add" and "subtract" control keys 91 and II, respectively, located at the left of the ordinal series of keys 24 for convenient access The keys are provided with the usual stems 89 extending through the keyboard 25 and connected in any suitable manner to opposite ends of a walking-beam lever 9i journaled on a short rod 92 carried by the frame of the machine. Pivotally secured to the lower end of the walking-beam lever lI is a connecting link 93, the opposite end of which is pivotally secured to an upwardly extending arm 94 mounted on a, bushing Journaled on a transverseshaft 95. Fixed to the shaft 95 is a segment plate 96 provided with a slot 91 for the reception of a stud 99 mounted on the arm 94. The stud 98 is normally held in rearwardly engaging position with the slot 91, as shown in Fig. 3, under tension of a spring 55 connected to arm 94 at II and to plate 95 at I92.

From the above arrangement it will be apparent that depression of either key 91. or 88 will, by means of walking-beam lever 9I, link 99 and arm 94, cause rocking of the shaft 95. The shaft 95 is maintained in either position to which it is so rocked by means of a yieldable detent I93 journaled on a transverse shaft I04 and provided with a stud I05 adapted to engage V-notches I09 in the upper surface of the segment plate 96. The detent stud is resiliently maintained in ensflgement with either one of the notches I99 in the plate 99 under tension of a spring I91, until moved out of engagement therewith and into engagement with the other notch I96 by rocking of the shaft 95 and the plate 96. Rocking movement of the shaft 95 in a, clockwise direction, viewing Fig. 3, is limited by engagement of a p arm I08 on the plate 96 with a stud I09 mounted upon one of the intermediate frame members 22, and counter-clockwise movement of the shaft 95 is limited by engagement of a stop arm III on the plate 96 with one of the frame tie-rods 22.

The rocking movements of the shaft 95 act to shift the disabling devices of the various denominational orders between active and inactive positions. For this purpose, an arm H2 is fixed to the shaft 95 in association with each denominational order of the machine. Each arm is connected by a vertical link III! with one member of the associated disabling device which, in this instance, comprises a curved link II4 pivotally mounted on a depending arm II5 of a lever H8 comprising another member of the device and conveniently called the subtraction or carry cutout lever. Formed on each link H4 is a shoulder H1, which of a lateral projection Ill, formed on the forward end of each link 55, when the shaft 95 is rocked in a clockwise direction from its normal position of Figs. 2 and 4, upon depression of key 95. From the construction and arrangement of the parts just described, itwill be apparent that depression of the subtraction control key II will walking-beam lever II in a counter-clockwise direction, viewing Fig. 3. Such motion of the walking-beam lever II is transmitted through pivotally connected link 95 is adapted to be moved into the path to arm 54, thus causing clockwise rotation of shaft .5 through the tensioning of spring 99 to overcome the detaining action of detent III. This movement continues until halted by arm III of segment 99 contacting stud. I99. This movement of the shaft 95 conditions the disabling devices for operation by imparting vertical movement to the links Ill, whereby shoulders III of links II4 are disposed inthe path of the lateral projections III on the links 55. The parts are resiliently maintained in this position by the detent I93.

The above mechanism also prevents rocking of the shaft 95 by depression of key when link 55 of the parallel motion device of any denominational order is in a forward position in response to depression of a key 24. When the link 55 is in a forward position due to depression of any of its associated keys 24, projection Ill is disposed immediately above shoulder II I on the associated link H4, and vertical upward movement of the link III connected thereto is restrained. The arm 94, however, is permitted limited movement with respect to segment 96, through the pin and slot connection 98, 91 therebetween. Consequently, tension set up in spring 99 by clockwise movement of arm 94 in the depression of subtraction control key 88 returns these partsto their normal position of Fig. 3 when the key 59 is released, whenever any link 55 is in its forward or operative position.

The carry cut-out lever I I6 of the disabling device in each denominational order is pivotally supported upon a cross shaft II9 extending through the main frame plates 22, and is provided with a lower end portion I2I (Figs. 2 and 4) curving forwardly and terminating in a tail which engages under a lateral extension I22 on the forward end of the carrying pawl 4I. In the normal position of the parts shown in Fig. 2, this forwardly extending tailportion I of the lever H9 will not interfere with the rearward and upward movement of the carrying pawl H in the swinging of the carrying lever 39 to impart a carrying im- Pulse to the lantern wheel 25. When it is de sired that a subtractive operation be performed, however, the subtraction control key 55 is depressed, rocking the shaft 95 and disposing the shoulders II! of all the links H4 in the path of the lateral projections III on their associated links 55. Upon depression of an ordinal key 24 movement is imparted to the parallel motion device in that order, as previously described, and the link 55 of the said order is moved forwardly, or to the right in Fig. 2. Upon forward movement of the actuated link 55, the projection III thereon engages shoulder II! on the associated link II4 to move the latter forward, thereby swinging the associated subtraction lever III which projects over into the next higher order in a counter-clockwise direction a very short distance from its normal position of Fig. 2. This forward movement of the subtraction lever III tensions a spring I25 which is connected between the upper end of the lever and a main frame plate 22, and normally tends to maintain the lever H5 in its normal position of Fig. 2. When so moved to its forward position by the associated link 55, the upper surface of the forwardly extending tail portion I2I of the lever Ill engages the lateral extension I22 to lift the forward end of the carrying pawl 4| of the next higher denominations] order and swing the latter in a counter-clockwise direction (Fig. 2) into inoperative position, where it is adapted to be held until released by the rearward motion of the carrying lever in a carrying operation, as will be later described.

The first ordinal key actuated in registration of the subtrahend determines the order in which figure of the corresponding order of the minuend' or when both subtrahend and minuend are of the same order. When the subtrahend has a less number of figures than the minuend and the first figure is of a value such that borrowing from a higher order or orders of the minuend is necessary the zero key (small figures) in each of such higher orders is actuated before the subtrahend is entered. To insure selection of the carry cut-out mechanism of the correct order in either case, the key of the highest Order to be actuated should complete its stroke before the key in any lower order is depressedsuificiently to trip its associated cut-out mechanism.

Means are provided for conditioning the machine for subsequent additive actuation by returning all of the carry cut-out levers H6 and associated parts to their normal position of Fig. 2, after the selected carrying pawl M has thus been moved to inoperative or carry foiling position and before the carrying operation takes place. For this purpose, a stud I24 is mounted on the forward end of each of the links 59, each one of which, as previously-described, is pulled toward the left, viewing Fig. 2, upon engagement of its associated hook member 58 with the related toothed wheel 65 upon depression of a key 24. As one of the links 59 moves rearwardly (to the left in Fig. 2) in response to depression of the key 24 representing the first figure of the subtrahend, stud I24 engages the arm H2 in the corresponding denominational order, which is fixedly secured to the shaft 35, and swings it in a counter-clockwise direction, rocking shaft 95 to the normal position shown in Fig. 2, where it i maintained by engagement of the stud I05 in the forward notch I06 under tension of spring M1. This rocking movement of the shaft 95 pulls all the links I I4 downward from their active to their inactive positions thereby withdrawing the shoulders II1 from the path of the projections H8, which allows the set carry cut-out lever i I6 to return to its normal position of Fig. 2 under contraction of its spring I23. Thus, the carry cut-out lever I I3 which has been moved to operative position is returned 'to normal inoperative position at. the end of the downward movement I IS with the carrying pawl 4I rocks the rearward end of the carrying pawl downward, thereby allowing a lateral extension I25 thereon (Fig. 2) to engage under a shoulder I26 provided on a latch I21 pivotally mounted on the carrying lever 39. The latch I21 is resiliently held in engagement with the lateral extension I25 of the carrying pawl under tension of a spring I23 to hold the carrying pawl in such inoperative osition. Consequently, rearward movement of the upper end of the carrying pawl 4I will be below the pins of the lantern wheel gear 28 when the carry transfer lever 39 is swung rearward in a carrying operation, and the carry which would normally take place by such movement of the carrying pawl will be foiled.

The rearward swing of the carry transfer lever 39 in such an attempted and foiled carrying opof the associated rack sector 42, and before accumulative action takes place upon the return movement of the rack sector and any resultant rearward swinging of the carrying lever 39 in a carrying operation.

Such automatic return movement of the shaft 33 to its normal position of Figs. 2 and 3 also functions to return the members 36, 34, 93 and 9|, and the add" and subtract keys 31 and 88 to their normal positions of Fig. 3. It will also be appreciated that all of the carry cut-out levers Iii and their associated parts may be selectively returned to their normal or inoperative positions of the drawings after the subtraction control key 83 has been depressed, and before depression of any ordinal key 24, merely by depressing the "add" key 31.

Mean is provided for latching the carrying pawl H in an inoperative position before and during the carry transfer operation, and for automatically releasing it after the carry has been foiled. As already described, engagement of the curved tail portion III of the carry cut-out lever eration is utilized to release the latch and allow the carrying pawl H to return to its normal position after the pawl has passed the pin of the lantern wheel gear 28 it would normally engage to produce a carry. This is accomplishedby means of an arm I3I, one of which is securely fixed to a transverse shaft I32 in each denominational order of the machine, which are normally maintained in the rearward position of Figs. 2 and 6 by a spring I33 connected at one end to a spring arm I34 and at the other end to a transverse shaft 535, as shown in Fig. 6. A lateral extension I36 (Fig. 6) is formed on the upper end of each arm I3I which is disposed in the path of a lower extension I31 (Fig. 2) of the associated latch I21. As the carrying lever 39 swings rearward in the carrying operation earlier described, the lower extension I31 of the latch I21 contacts the lateral extension i136 formed on the arm IN and, as the carrying lever 39 continues its rearward movement, the lateral extension I25 on the carrying pawl ll rides from under the shoulder I26 on the latch E21 allowing the rearward end of the carrying pawl M to rise to its normal operative position of Fig. 2, where it is maintained during the return movement of the carry transfer lever 39.

In the event that a carrying pawl ll were inadvertently latched up by erroneously depressing the subtraction control key 38 and an ordinal key 24, it will be apparent that the result of the subsequent calculation would be incorrect, unless means are provided for releasing the latch I21 thus made operative. It is the usual practice for the operator, before beginning a calculation or after an error has been made, to clear or zeroize the numeral wheels. Therefore, releasing means are provided to act coincident with the zeroizing operation to return the parts to their normal inoperative position of the drawings for additive actuation. This releasing function is accomplished through the forward movement of the zeroizing lever 18 and its associated lever 83 which is pivotally connected by means of a slotted link I31 (Fig. 5) to a stud I38 mounted on an upright arm' I39 fast on the shaft I32. As the lever 33 is moved forwardly upon operation of the zeroizing lever 19 (to the right in Fig. 5), the rearward portion of the slot in link- I31 engages the stud I33 and rocks the shaft I32 in a clockwise direction. As has been moved to operative position, and urge the latch forwardly or to the right, viewing Fig. 2, to disengage the shoulder I28 from the lateral projection I25 on the carrying pawl I. It will be noted from Fig. that rocking movements of the shaft I32 are limited by the ends bifurcated portion I I! of the arm I39, which is fixed to said shaft, contacting a transverse shaft I", the spring in shown in Fig. 6 normally retaining the arm I" in the position of Fig. 5.

Coincident with the above-described releasing action of a set latch I21, rocking movement of the shaft 8| in a zeroizing operation is also utilized. to rock the shaft 85 in a rearward or counter-clockwise direction (viewing Fig. 5) to return the links ill and Ill to their normal inoperative position of the drawings, thus removing the shoulders II] from the paths of the projections 8 on the links 55, providing they have been left set inadvertently. A stud I (Fig. 5) is provided in the lower portion of the arm 86 to contact an arm it! fast to the shaft 96; when the shaft 68 is rocked in a forward direction. This engagement of the stud I 44 with arm I results in counter-clockwise rotation of the shaft 95, which movement is transmitted through arms H2 and links H3 to remove shoulders III of links ill from the paths of lateral projections II! when links 55 are moved forwardly in response to the depression of ordinal keys 2.

It will be apparent that rocking of the shaft 95 cannot be accomplished by depression of key 88 when the zeroizlng lever 19 is in a forward position and stud I is in engagement with the arm I". In order to prevent bending and twisting of the parts, if it is attempted to forcibly depress the subtraction control key 88 under such conditions, the shaft as is given limited movement, as already described, through en- Easement of stud 88 of arm 94 in slot 81 of the segment 86. Tension set up in spring 99 by such limited movement resulting from depression of key 88 returns the parts to the normal position of Fig. 3 when the key 88 is released.

It is thought that the invention and its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the form hereinbefore described being merely a preferred embodiment thereof.

I claim as my invention:

1. In a calculating machine having a series of denominational orders of accumulator mechanism including automatic tens carrying mechanism, actuating mechanism for said accumulator, and depressible keys for effecting operation or said actuating mechanism; normally inoperative means adapted to be operated in response to the depression of any one of said keys for preventing effective operation of a selected tens carrying mechanism, said means being normally incapable of operation by the keys, and manipulative means for rendering said means operable by the keys.

2. A calculating machine having, in combination, a multiple order accumulator mechanism including automatic carrying mechanism, actusting mechanism for each order operable to actuate the corresponding order of the accumulator in variable degrees of actuation, a denominational order of keys for the actuating of a lower mechanism of each order operable to determine the digital setting of the mechanism, subtraction mechanism including a disabling device individually associated with each order of accumulator mechanism operable to disable the carrying mechanism of its order to prevent a carry of tens to the next higher order, each of said disabling devices having one position in which it is inactive, another position in which it is set for operation, and a third position in which it acts to disable the carrying mechanism of the order, subtraction control means manually operable to shift all of said devices simultaneously from their inactive to their set positions, means responsive to the actuation of any key of one of said denominational orders for operating the disabling device of that order from its set position to its disabling position, and other means operative upon the depression of said key to restore the disabling devices to their inactive positions.

3. In a calculating machine having a series of denominational orders of accumulator mechanism including carrying mechanism for transferring the tens from slower to a higher denominational order, actuating mechanism for said accumulator mechanism, and depressible keys for controlling the operation of said actuating mechanism; means. for disabling said carrying mechanisms, normally inoperative means connected to said disabling means, and means for positioning said last means for operation to disable a said carrying mechanism upon depression of a said key.

4. In a calculating machine having an accumulator including tens transfer devices, an actuating mechanism for said accumulator mechanism, and keys for controlling the operation of said actuating mechanism; means for latching said tens transfer devices in an ineifective position, and means functioning in response to the operation of a said key for moving a said tens transfer device into engagement with said latching means to be latched thereby.

5. In a calculating machine having an accumulator including tens transfer devices, an actuating mechanism for said accumulator mechanism, and keys for controlling the operation of said actuating mechanism; means for latching said tens transfer devices in an ineffective position, means iuctioning in response to the operation of a said key for moving a said ten transfer device into engagement with said latching means to be latched thereby to foil a carrying action, and means operable to release said tens transfer device from said latching means after a carrying action has been foiled.

6. In a. calculating machine having an accumulator including tens transfer devices, an actuating mechanism for said accumulator mechanism, and keys for controlling the operation of said actuating mechanism; means for latching said tens transfer devices in an ineiiective position, means functioning in response to the operation of a said key for moving a said tens transfer device into engagement with said latching means to be latched thereby, and selectively operable means for rendering said last named means operative or inoperative.

7. In a calculating machine having an accumulator including tens transfer devices, an actuating mechanism for said accumulator mechanism, and keys for controlling the operation of said actuating mechanism: means for latching said tens transfer devices in an ineffective position, means functioning in response to the operatlon of a said key for moving a said tens transfer device into a position to be latched by said latching means to foil a carryingoperation thereby, selectively operable means for rendering said last named means operative r inoperative, and means operable by said actuating mechanism after said tens transfer device has been engaged with said latching mechanism for returning said selectively operable means and the key responsive means rendered operative thereby to inoperative position.

8. In a calculating machine having an accumulator including tens. transfer devices, an actuating mechanism for said accumulator mechanism, and keys f0r controlling the operation of said actuating mechanism; means for latching said tens transfer devices in an ineffective position, means functioning in response to the operation of a said key for moving a said tens transfer device into engagement with said latching means to foil a carrying operation thereby, selectively operable means for rendering said last named means operative or inoperative, means operable by said actuating mechanism after said tens transfer device has been engaged with said latching mechanism for returning said selectively operable means and the key responsive means rendered operative thereby to inoperative position, and means operable to release'said tens transfer device from said latching means after an attempted carrying operation has been foiled.

9. In a calculating machine having an accumulator including tens transfer mechanisms, actuating mechanism for said accumulator, and depressible keys for controlling said actuating mechanism; settable means operable in response to the depression of a said key for preventing the operation of a said tens transfer mechanism, and means included in said actuating mechanism shiftable into blocking relation to said settable means to prevent the setting of the same during operation of said actuating mechanism.

10. In a calculating machine having an accumulator including tens transfer devices, actuating mechanism for said accumulator, depressible keys for controlling said actuating mechanism, means for aeroizing said accumulator, and manually operable mechanism for actuating the zeroizing means; means for latching said tens transfer devices in ineffective position, normally inoperative means operable upon depression of a said key for moving a said tens transfer device into engagement with said latching means to be latched thereby, settable means for rendering said tens transfer device moving means operative, and means actuated by said manually operablemechanism to release said latching means and move said tens transfer device moving means and said settable means to an inoperative position. 7

11. A calculating machine having, in combination, a multiple order accumulator mechanism including automatic carrying mechanism, actuating mechanism for each order operable to actuate the corresponding order of accumulator mechanism in variable degrees of actuation, a denominational order of digital keys for each order ofactuating mechanism operable to determine the digital setting of the mechanism of that order, normally inactive carry cut-out mechanism individually associated with each order of accumulator mechanism operable to disable the carrying mechanism of the order, a subtraction control device, and means operated by said control device for simultaneously conditioning all of said cut-out mechanisms for operation by their associated digital keys.

12. In a calculating machine having a multiple order accumulator including a tens carrying device for each order, actuating mechanisms for the accumulator, and denominational orders of keys for controlling the actuating mechanism; the combination of normally inactive subtraction mechanisms operable to prevent the carrying of tens by the carrying devices of the respective orders, means actuated by the keys for operating the subtraction mechanism of the corresponding orders, and a single manipulative member operable to condition said subtraction mechanisms for such operation by the keys.

13. In a calculating machine having a multiple order accumulator including a tens carrying device for each order, actuating mechanisms, for the accumulator, and denominational orders of keys for controlling the actuating mechanism; the combination of normally inactive subtraction mechanisms operable to prevent the carrying of tens by the carrying devices of the respective orders, meansactuated by the keys for operating the subtraction mechanism of the corresponding orders, a single manipulative member operable to condition said mechanisms for such operation by the keys, and means for restoring the conditioned subtraction mechanisms to inactive position upon the actuationof any one of the keys.

14. In a calculating machine having a multiple order accumulator with a series of automatic tens carrying mechanisms and a foil means for each said mechanism adapted when actuated to disable the same, a plurality of ordinal columns of value keys, ordinal means actuated selectively in response to the depression of said keys for actuating said accumulator, manual settable means for conditioning the foil means of all said tens carrying mechanisms for actuation, the selectiveiy actuated ordinal means being operable to actuate the conditioned foil means corresponding to the column in which the depressed key is found, and means responsive to the depression of said key to restore the conditioned foil means to normal condition.

15. In a calculating machine having a multiple order accumulator with a series of ordinal automatic tens carrying mechanisms and a foil means for each such mechanism, a plurality of ordinal columns of value keys, manually settable means for conditioningv the several foil means for operation for purposes of subtraction, means operative in response to the depression of a value key in a selected one ofsaid columns to actuate the conditioned 1011 means of the order corresponding to the selected column, and means responsive to the depression of said key for restoring the conditioned foil means to normal condition.

16. In a calculating machine having a multiple order accumulator with a series of ordinal automatic tens carrying mechanisms and a foil means for each such mechanism adapted when actuated to disable the same, a plurality of ordinal columns of value keys, manually settable means for conditioning all of said foil means for actuation, a series of ordinal elements selectively shiftable upon the depression of any one of said keys in accordance with the column in which said key is found to actuate the conditioned foil means of its corresponding tens carrying mechanism, and

II means responsive to the depression of said key for restoring the conditioned roll means to normal condition.

17. In a calculating machine having a multiple order accumulator with automatic ordinal tens carrying means and a plurality of ordinal columns of value keys, a series of ordinal actuator elements movable in response to the depression of said keys selectively in accordance with the column in which the depressed key is found for operating said accumulator, subtraction means for rendering said tens carrying means ineffective including a series of ordinal motion transmitting elements shiftable into operative association with respective ones of said actuator elements for movement thereby,- means operable manually to shift said motion transmitting elements simultaneously into operative association with said actuator elements, and means responsive to the depression of any of said value keys for withdrawing the motion transmitting elements from operative association with their respective actuator elements.

18. In a, calculating machine having a multiple order accumulator with a series of automatic tens carrying mechanisms and a foil means for each said mechanism adapted when actuated to disable the same, a plurality of ordinal columns of value keys, ordinal means actuated selectively in response to the depression of said keys for actuating said accumulator and each including a member shifted through a predetermined stroke, manually settable means for conditioning the foil means of all said tens carrying mechanisms for actuation, the selectively actuated ordinal means being operable through its shiftable member to actuate the conditioned foil means corresponding to the column in which the depressed key is found, and power actuated means operable in response to the depression of said key for restoring the conditioned foil means to normal condition.

19. In a calculating machine having an accumulator including tens transfer devices, an actuating mechanism for said accumulator mechanism, and keys for controlling the operation of said actuating mechanism; each of said transfer devices including a carrying pawl, and means functioning in response to the operation of a said key for holding the corresponding carrying pawl in ineffective position, said means including a latch tooth on the carrying pawl, a spring actuated latch element for coaction with said tooth, and a key responsive member for shifting said pawl to carry its latch tooth into engagement with said element.

JOSEPH A. V. TURCK. 

